I was mostly pulling the Ex's and Su's out of my ear; I've never been good determining what ability is which (my big homebrew weakness, so to speak).

And yes, that DC is a typo, it should be AC.

About the weapon: You're saying his hammer should match his alignment at 7th and be ghost touch at 17th? Just to make sure I got it right. As for the shape: I was going to make changing its shape a feat, and give it to him at least once to fill a dead level. Each time you take it you gain the ability to make it a melee weapon of your choice that you're proficient with, though you still have to summon it as the shape you want; you can't change it after it's summoned.

Elemental Grace: I'm aware of this; I thought it over before giving it to him. I think it fits the feel. Frankly, I wanted him to have it even earlier (at level 6, where it's currently empty).

Elemental Vision: I'll look this up and get back to you on it.

How's it look now? This guy is supposed to be the ultimate melee combatant. He gets no ranged abilities at all, but my goal was still tier 3.